//5.
#include<stdio.h>
#define PI 3.1415926
int main()
{
	int r = 10;
	float area = 0.0f;
	for(int i = 1; i <= r; i++)
	{
		area = PI * i * i;
		if(area > 100)
		{
			printf("r = %d,area = %f 大于100!\n",i ,area);
			break;
		}
		printf("r = %d,area = %f\n",i ,area);
	}
	
	return 0;

}
